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Finding the Fourth Proportional to 143,805.66, 198,503.91 and 87,215.82

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Solution

The fourth proportional to 143,805.66, 198,503.91 and 87,215.82 is: 120,389.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,805.66 : 198,503.91 = 87,215.82 : x
  2. Step 2: Convert to fraction form
    143,805.66/198,503.91 = 87,215.82/x
  3. Step 3: Cross multiply
    143,805.66x = 198,503.91 × 87,215.82
  4. Step 4: Simplify right side
    143,805.66x = 17,312,681,283.86
  5. Step 5: Solve for x
    x = 17,312,681,283.86/143,805.66
  6. Step 6: Final answer
    x = 120,389.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.